Brake



G. J. THOMAS May 9;, 1933.

BRAKE Original Filed Nov. 3, 1924 IIIII/I/IAIIIIIIIIIH 1 INVENTOR eoizge Jflamaw A TTORNE Y Patented May 9, 1933 UNITED STATES PATENT OFFICE GEORGE JOSEPH THOMAS, OF DETROIT, MICHIGAN, ASSIGNOR '10 BFLN'IDIX BRAKE I COMPANY, OF SOUTH BEND, INDIANA, A CORPORATION OF ILLINOIS BRAKE I Original application filed November 8, 1924, Serial No. 747,669. Divided and this application filed March 25, 1929. Serial No. 349,747.

' there is self-energizing action and servo action in both directions of drum rotation and to this end I preferably employ two separate sets of shoes, each set comprising two shoes, a primary and a secondary shoe. The shoes of each set are preferably connected by an articulating or floating joint, the primary shoe or servo shoe functioning, by

virtue of the wiping action of the rotating drum, to apply the secondary or anchored shoe of the set. Each secondary shoe, by virtue of its fixed anchor, is rendered self energizing with the drum rotating toward its anchor.

My present invention is further directed to the problem of increasing the braking surface of the two sets of shoes to a maximum and at the same time obtaining the necessary drum clearance with a minimum of cam movement in taking up said clearance.

The above and other objects. and desirable particular constructions and combinations of parts will be apparent from the detailed description of the invention and brief description of the drawing, in which:

Figure 1 is a side elevation of my novel brake looking toward the brake support and taken just inside the head of the brake drum;

Figure 2 is a partial section taken at 2-2 of Figure 1 through the single anchor member for the brake elements; and

Figure 3 is a section taken on the line 33 of Figure 1 showing the floating joint between the two shoes of one of the friction devices and further showing the adjustment of said joint.

As disclosed in Figure 1, the brake comprises two sets of two shoes each, each set comprising a servo shoe or primary shoe and a secondary shoe all anchored by a common anchor post 10 fixedly secured to the brake support plate 12. The set to the left in Figure 1 comprises'the single webbed servo shoe 14 provided with a rim 16 and lining 18, the web thereof extending at one end, between the flat ended fur-cations 20 of the single webbed secondary shoe 22 of the set. An articulating pin 24 secures the webs together, and an eccentric 26, adjustably secured' to the brake support, contacts the inner furcation 20 of the shoe 22 and functions as a stop to determine the idle position of the shoes of the set. The connection between the shoes 28 and 30 of the right hand friction device is a replica of the aforementioned connection between shoes 14 and 22.

An important feature of the novel brake combination resides in the connection between the two sets of shoes wherein shoe 30 is preferably bifurcated at one end to straddle the end of the web of shoe 22, all as clearly disclosed in Figure 2. The aforementioned pivot pin or anchor post 10 is journaled in the ends of the furcation 32 and detachably but rigidly connected to the support plate 12. The web of shoe 22 is prefera 1y ad ustably connected to the furcations 32 by'an eccentric pin 34, the latter being detachably secured to one of the fur-cations 32. The web is also slotted at 35 to permit free movement of the shoe 22 about the pin 10.

In operation, movement of the brake cam 36, against the action of the return springs 38 and 40, functions to simultaneously spread the servo shoes 14 and 28 into drum contact.

tion is efiected, shoes 28 and 30 functioningas do shoes 14. and 22 with counter-clockwise movement.

With counter-clockwise rotation of the With the drum rotating counter-clockwise drum the braking torque of shoes 14 and 22 is taken by the compound pivot comprising pins 34: and 10, the ultimate anchoring being on pin 10 and with clockwise rotation shoes 28 and 30 are directly anchored on the anchor pin 10.

While but a single embodiment of the-invention is disclosed and described in detail, it is not my desire to limit myself thereto,'it being my intention to be limited only by the scope and terms of the appended claims.

This application constitutes a division of subject-matter disclosed in my co-pending application No. 747,669, filed November 3, 1924.

I claim 1. A brake comprising, in combination with a. drum, four brake shoes having a single anchor and a single applying device adjacent the drum and acting on said shoes to force them against the drum for simultaneous effectiveness, said anchor being laterally displaced from the drum diameter including the applying device. 4

2. A brake mechanism includin a pair of friction devices jointly en aged y a common applying means, eac friction device comprising articulated members, all members of the brake being anchored on a common anchor by'a direct anchorage of one member. ,I 3. A brake comprising four juxtaposed elements, two of said elements being anchored by a compound pivot.

4.. A brake comprising, in combination; four shoes, a single stationary anchor pivot for the four shoes arranged intermediate the ends of one of the shoes and at the end of one of the shoes, two of said shoes being single anchor.

being anchored by a common anchor means and each shoe having at least one end coacting agamst a fixed means.

12. A brake comprising two pairs of shoes anchored on a common anchor, and means on one pair for adjusting the other pair relative to the anchor.

. 13. A brake comprising two pairs of shoes anchored on a common anchor, one pair having an articulated connection to the anchor and a member on one pair for adjusting the other. pair relative to the anchor.

14. A brake comprising two pairs of shoes anchored on a common anchor, one pair havmg. adlrect and the other pair an lndlrect.

connection to the anchor and means on the pair having a direct connection to the anchor for adjusting the other pair relative to the anchor.

In testimony whereof I have hereunto signed my name.

GEORGE JOSEPH THOMAS.

7. A brake including a rotatable drum and friction means within the drum acting on a common zone thereof and comprising four articulated members positively anchored on a single common anchor member.

8. A single-anchor four-shoe brakecomprising, in combination, an intermediate shoe anchored at one end, a pair of shoes pivotally connected to the intermediate shoe adjacent its opposite ends and a fourth shoe pivotally connected to one of the aforementioned pair of shoes to form a connected assembly.

9. A single-anchor four-shoe brake comprising, in combination, a backing plate, an. 

